Lol. To be honest, I'm just reaching too low. Oblivion was my first ES game. So when we went from omnipotent guards who ran into houses from the other side of town because it took you two hits to kill a sleeping person, to guards with separate bounties, and killable witnesses, I was happy.
I said Cyrodil, because other than Skyrim, it's the only continent I'm familiar with. Morrowind seems popular, but other than the small taste of it Skyrim gave a bit back, I have no clue. I just want an environment that is more fantasy.
Companion AI is better, but still needs improvement. Most of the time companions hindered me in Skyrim so I rarely took one (in Oblivion taking one was a guaranteed jail sentence, lol). I typically play a thief, with blades and a bow. If they're not jumping in front of me while I'm swinging my weapon, they're charging the enemy while I'm lining up a stealth shot.
As for combat, I wish there was a way to marry Dark Souls combat into ES. Add in Fallout's location specific damage as well. I'd like to be able to slash away at a mammoth's ankle, and make it take a knee or something.